One thing that I've found about spanking fetishists (and foot fetishists, for that matter), is that a lot of them don't seem to understand that for the bulk of us non-fetishists, their kink isn't even a turnoff. It's literally something we see as non-sexual and really don't comprehend the appeal of at all. They might as well be zooming in on a girl's elbow, or obsessing over their...I dunno, nostril circumference or whatever.
Great, now all the elbow and nostril fetishists are going to get on my case for kink-shaming.
Anyways, yeah, Cosy Cafe is a bit spanking heavy....but hey; it's the Dev's game and that's their kink, so you can't really hold that against them. So when a spanking scene pops up again (and again, and again...), I just roll my eyes and click through it, so I can get back to the good stuff.
...And to throw in my two cents in about Rachel, I could see her as a 5-on-the-Kinsey-scale peripheral part of the Harem, but not really a full-fledged member. Basically her holding a perspective of: "yeah, your dick is great and whatever, but I'm mainly here for the collateral pussy". Buuuut, while it's a plausible scenario (in my head, at least), it doesn't really seem to mesh with Cosy Creator's strict maledom bent in their writing, so I'm betting it will go some other way.